Wide-Swath Altimetry | ScienceGate

The spaceborne interferometric synthetic aperture radar (InSAR) is expected to measure the sea surface height (SSH) with high accuracy over a wide swath. Since centimeter-level accuracy is required to monitor the ocean sub-mesoscale dynamics, the high accuracy implies that the altimetric errors should be totally understood and strictly controlled. However, for the dynamic waves, they move randomly all the time, and this will lead to significant altimetric errors. This study proposes an analytical method for the dynamic wave-related errors of InSAR SSH measurement based on the wave spectrum and electromagnetic scattering model. Additionally, the mechanisms of the dynamic wave-related errors of InSAR altimetry are analyzed, and the detailed numerical model is derived. The proposed analytical method is validated with NASA’s Surface Water and Ocean Topography (SWOT) project error budget, and the Root-Mean-Square Errors (RMSEs) are in good agreement (0.2486 and 0.2470 cm on a 0.5 km2 grid, respectively). Instead of analysis for a typical project, the proposed method can be applied to different radar parameters under multiple sea states. The RMSEs of Ka-band under low sea state, moderate sea state, and high sea state are 0.2670, 1.3154, and 6.6361 cm, respectively. Moreover, the RMSEs of X-band and Ku-band are also simulated and presented. The experimental results demonstrate that the dynamic wave-related errors of InSAR altimetry are not sensitive to the frequencies but are sensitive to the sea states. The error compensation method is necessary for moderate and higher sea states for centimetric accuracy requirements. This can provide feasible suggestions on system design and error budget for the future interferometric wide-swath altimeter.

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Simulation of the Wide Swath Sea Surface Height Calibration Using GNSS Buoy Array

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium ◽

10.1109/igarss39084.2020.9323581 ◽

2020 ◽

Author(s):

Xi-Yu Xu

Keyword(s):

Sea Surface Height ◽

Sea Surface ◽

Wide Swath

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Simulation Study on Baseline Error Estimation of Wide-Swath Altimeter by Interferometric Phase After Flat-Earth Phase Removal

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium ◽

10.1109/igarss39084.2020.9324081 ◽

2020 ◽

Author(s):

Xiangying Miao ◽

Hongli Miao

Keyword(s):

Error Estimation ◽

Simulation Study ◽

Interferometric Phase ◽

Baseline Error ◽

Wide Swath

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Efficiency and Robustness Improvement of Airborne SAR Motion Compensation With High Resolution and Wide Swath

IEEE Geoscience and Remote Sensing Letters ◽

10.1109/lgrs.2020.3031304 ◽

2020 ◽

pp. 1-5

Author(s):

Jianlai Chen ◽

Buge Liang ◽

Junchao Zhang ◽

De-Gui Yang ◽

Yuhui Deng ◽

...

Keyword(s):

High Resolution ◽

Motion Compensation ◽

Airborne Sar ◽

Wide Swath

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A test of airborne, side-looking synthetic-aperture radar in central Newfoundland for geological reconnaissance

Canadian Journal of Earth Sciences ◽

10.1139/e91-025 ◽

1991 ◽

Vol 28 (2) ◽

pp. 257-265 ◽

Cited By ~ 14

Author(s):

D. F. Graham ◽

D. R. Grant

Keyword(s):

Surface Roughness ◽

Synthetic Aperture Radar ◽

Three Dimensional ◽

Synthetic Aperture ◽

Structural Elements ◽

Terrain Classification ◽

Regional Trends ◽

Valuable Complement ◽

Wide Swath ◽

Aperture Radar

Side-looking, C-band synthetic-aperture radar (SAR) penetrates cloud and fog, and operates day or night, to produce pseudo-three-dimensional terrain images with enhanced topography and surface roughness. The images, which have a 20 m resolution and cover large areas, have been used to map the regional trends, patterns of lineaments, and terrain types over a 6200 km2 area of complex lithology, structure, and drift cover. Four lineament classes are differentiated. Glacial trends are clear, and bedrock structures (faults, fractures, joints, foliation, and folded bedding) with relief expression at the surface show through the drift as lineaments. They accurately reproduce most known features when compared with bedrock and Quatenary geology maps. Hitherto unrecognized structural elements are revealed. Tones and textures reflect minute surface roughness variations useful in terrain classification. SAR wide-swath-mode imagery is thus a valuable complement to aerial photography, and is superior in revealing hummocky moraine, ribbed moraine, boulder fields and stony till. Wider use of this imagery is encouraged.

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Study on Pivotal Errors of WSM Interferometry

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.718-720.389 ◽

2013 ◽

Vol 718-720 ◽

pp. 389-392

Author(s):

Ting Chen Jiang

Keyword(s):

Short Interval ◽

Bam Earthquake ◽

Orbit Data ◽

Wide Swath

Wide swath SAR (WSM) has some characters such as wider swath and short interval so that it can be applied widely to monitor deformation, especially it has largo foreground for monitoring slowness deformation.Depessing baseline and DEM error is a key choke point for ScanSAR interferometry.In this paper, ScanSAR imaging principle and error elements are analyzed, in allusion to wide swath SAR interferogram of bam earthquake, influence magnitude of SRTM3 and GDEM for ScanSAR interferometry is compared each other.,at the same time, results of ScanSAR interferometry which use Envisat orbit data ofthree different kinds are studied, in the end ,some referenced and important conclusions are gained.

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Cost Effective Swath Bathymetry

Marine Technology Society Journal ◽

10.4031/002533201788057982 ◽

2001 ◽

Vol 35 (4) ◽

pp. 33-45 ◽

Cited By ~ 3

Author(s):

Peter Hogarth

Keyword(s):

Processing Time ◽

Cost Effective ◽

High Accuracy ◽

High Coverage ◽

Swath Bathymetry ◽

World Survey ◽

Set Up ◽

Very High ◽

Harbor Area ◽

Wide Swath

Between 23rd and 25th July 2001 GeoSwath, a high specification shallow water wide swath bathymetry system, was used to survey the entire Portsmouth NH Harbor area. This paper deals with the results of this survey, illustrating the potential for significant reductions in the high costs, which have prevented widespread proliferation of Swath Bathymetry systems to date. Data, including a complete DTM gridded to 1 m resolution, will be presented and discussed in detail. These results show that the system is very easy to set up and use, requires greatly reduced boat and processing time, whilst offering high accuracy and very high coverage and resolution when used in a real-world survey of a dynamic harbor environment.

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